When I depress and release the clutch on my '81 Toyota 4WD P/u (only 102K miles and in great shape), I get a whining sound. Doesn't happen all the time, just started a couple days ago, not getting any worse. Short sharp whine, sometimes a bit longer. Only when changing gears. Also when backing up. All seems to happen around the clutch depression and keeping the clutch actively engaged (i.e. right on the edge of engaging). Have topped off clutch, brake, transmission fluids. Any ideas?
There is a bearing that presses on the center of the clutch release arms when you put your foot down, it's called the clutch release bearing. It sounds like yours is starting to go bad. There is also a bushing or bearing in the back of the crankshaft that can cause this noise. the the input shaft of the transmission is stabilized in this. These two items are almost always replaced when a clutch job is performed. Unfortunately that is the only way to get at these two bearings. You may be able to drive the vehicle for quite a few more miles. but this is a sign of things to come.
Bad bearings. Perhaps a throw out bearing. The pressure on it varies depending on whether your pushing on the pedal or not, and how much. If the noise occured only when the truck is moving, then I would say it is the input bearing. Changed alot of those years ago.
Replace throw bearing..........
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